[INFO] fetching crate plotlib 0.5.0...
[INFO] checking plotlib-0.5.0 against master#d939f708d960161d23b964309ba68ff207fc0ead for pr-70087
[INFO] extracting crate plotlib 0.5.0 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate plotlib 0.5.0 on toolchain d939f708d960161d23b964309ba68ff207fc0ead
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d939f708d960161d23b964309ba68ff207fc0ead" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate plotlib 0.5.0
[INFO] finished tweaking crates.io crate plotlib 0.5.0
[INFO] tweaked toml for crates.io crate plotlib 0.5.0 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate plotlib 0.5.0 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+d939f708d960161d23b964309ba68ff207fc0ead" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded svg v0.7.1
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+d939f708d960161d23b964309ba68ff207fc0ead" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 3cfad9fe2926bf03a70411d56ac96cf4dccfcea3750c0ab3a94adb9217b54afd
[INFO] running `"docker" "start" "-a" "3cfad9fe2926bf03a70411d56ac96cf4dccfcea3750c0ab3a94adb9217b54afd"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking svg v0.7.1
[INFO] [stderr]     Checking backtrace-sys v0.1.34
[INFO] [stderr]     Checking backtrace v0.3.45
[INFO] [stderr]     Checking failure v0.1.7
[INFO] [stderr]     Checking plotlib v0.5.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/repr/boxplot.rs:38:31
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn from_slice(v: &'a [(f64)]) -> Self {
[INFO] [stderr]    |                               ^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unnecessary parentheses around type
[INFO] [stderr]   --> src/repr/boxplot.rs:38:31
[INFO] [stderr]    |
[INFO] [stderr] 38 |     pub fn from_slice(v: &'a [(f64)]) -> Self {
[INFO] [stderr]    |                               ^^^^^ help: remove these parentheses
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_parens)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::repr`
[INFO] [stderr]    --> src/text_render.rs:619:13
[INFO] [stderr]     |
[INFO] [stderr] 619 |         use crate::repr;
[INFO] [stderr]     |             ^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `round`
[INFO] [stderr]    --> src/axis.rs:152:4
[INFO] [stderr]     |
[INFO] [stderr] 152 | fn round(x: f64) -> f64 {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `render_face_points`
[INFO] [stderr]    --> src/text_render.rs:346:8
[INFO] [stderr]     |
[INFO] [stderr] 346 | pub fn render_face_points(
[INFO] [stderr]     |        ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `round`
[INFO] [stderr]    --> src/axis.rs:152:4
[INFO] [stderr]     |
[INFO] [stderr] 152 | fn round(x: f64) -> f64 {
[INFO] [stderr]     |    ^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `plotlib::style::BoxStyle`
[INFO] [stderr]  --> examples/letter_counter.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use plotlib::style::BoxStyle;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.56s
[INFO] running `"docker" "inspect" "3cfad9fe2926bf03a70411d56ac96cf4dccfcea3750c0ab3a94adb9217b54afd"`
[INFO] running `"docker" "rm" "-f" "3cfad9fe2926bf03a70411d56ac96cf4dccfcea3750c0ab3a94adb9217b54afd"`
[INFO] [stdout] 3cfad9fe2926bf03a70411d56ac96cf4dccfcea3750c0ab3a94adb9217b54afd